US3680489A - Vehicle propelled by linear motor - Google Patents

Vehicle propelled by linear motor Download PDF

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Publication number
US3680489A
US3680489A US21273A US3680489DA US3680489A US 3680489 A US3680489 A US 3680489A US 21273 A US21273 A US 21273A US 3680489D A US3680489D A US 3680489DA US 3680489 A US3680489 A US 3680489A
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Prior art keywords
stator
track
reaction rail
vehicle
reaction
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US21273A
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English (en)
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Christopher Durrant English
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Tracked Hovercraft Ltd
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Tracked Hovercraft Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60V—AIR-CUSHION VEHICLES
    • B60V3/00—Land vehicles, waterborne vessels, or aircraft, adapted or modified to travel on air cushions
    • B60V3/02—Land vehicles, e.g. road vehicles
    • B60V3/04—Land vehicles, e.g. road vehicles co-operating with rails or other guiding means, e.g. with air cushion between rail and vehicle

Definitions

  • the stator is connected to the vehicle body 1 by a linkage which is capable of transmitting only a [52] "104/148 104/23 180/7 longitudinally directed force such as the stator tractive 310/12 318/ force, and is guided by guide means which co-operate [51] Int. Cl. ..B61l 13/00 with the reaction i preferably between the reaction Field of seal'dl 104/148 LM, 23 F5, 23; plate and the track and which are so arranged as to be incapable of transmitting any substantial rolling moment to the reaction rail.
  • Stator support and roll control is effected separately from the stator guidance.
  • SHEET 3 [IF 3 VEHICLE PROPELLED BY LINEAR MOTOR
  • This invention relates to a vehicle, in particular an air cushion vehicle, which in operation is propelled along a prepared track by a linear induction motor of which the primary member, hereinafter to be referred to as the stator, is carried by the vehicle and the secondary member or rotor is provided by an electrically conductive reaction plate mounted on the track.
  • stator having two interconnected parts which for operation are arranged to embrace in spaced relationship the reaction plate extending between them.
  • the invention concerns vehicle having such a stator arranged for co-operation with a generally vertical reaction plate forming part of a reaction rail mounted on the track.
  • the body of the vehicle is movable relatively to the track in directions other than the longitudinal direction. These other movements can be substantial.
  • the movement of the stator laterally of the track is limited to the spacing of the stator parts minus the thickness of the reaction plate between them. For acceptable induction motor efficiencies this amount of allowable movement is considerably smaller than the corresponding movement of the vehicle body relative to the track.
  • reaction rail for such stator guidance, but this creates difficulties so far as the reaction rail is concerned.
  • vehicle for operation along a prepared track comprises a double-sided linear induction motor stator for propelling the vehicle by electro-magnetic co-operation with a generally vertical, electrically conductive and non-magnetic reaction plate forming part of a reaction rail mounted on the track, means connecting the stator to the vehicle body for independent movement with respect thereto except in a longitudinal direction, guide means carried by the stator and adapted for cooperation with the reaction rail for maintaining the stator substantially at a predetermined lateral position relative to the reaction rail, the guide means being arranged so as to be incapable of transmitting any substantial rolling moment to the reaction rail, support means for supporting the stator, and roll control means for providing the stator with stability in roll.
  • the vehicle is arranged for the guide means to co-operate with the reaction rail between the reaction plate and the track.
  • the guide means comprise a plurality of wheels carried by the stator and adapted to run on op posed side surfaces of the reaction rail in a common plane of contact between the reaction plate and the track.
  • the support means and roll control means are provided by the same devices. These may, for example, comprise laterally spaced air cushion pads carried by the stator and arranged to co-operate with track surfaces on either side of the reaction rail, or they may comprise generally vertical connections pivotally connected between the stator and the vehicle body on each side of the reaction rail and controllable differentially or in unison by associated control means.
  • FIG. 1 shows in simplified cross section the general arrangement of the first air cushion vehicle in operation
  • FIG. 2 shows in greater detail the support, roll control and guidance means provided for the double-sided linear induction motor stator of the first air cushion vehicle
  • FIG. 3 is a perspective view of a part of the first air cushion vehicle
  • FIG. 4 shows the support, roll control and guidance means for the double-sided linear induction motor stator of the second air cushion vehicle
  • FIG. 5 is a perspective view corresponding to FIG. 3 of part of the second air cushion vehicle.
  • an air cushion vehicle 1 is arranged for operation along a prepared concrete track 2 having a cross section generally in the form of an upright T.
  • the body of the vehicle is supported above the track by longitudinally spaced pairs of air cushion support pads 3 (of which one pair is shown) co-operating with the top of the track at generally horizontal support surfaces 4 through the medium of cushions of pressurized air which they form and maintain.
  • the vehicle body is guided along the track by longitudinally spaced pairs of air cushion guidance pads 5 co-operating with generally vertical guidance surfaces 6 provided by the leg of the track.
  • each air cushion pad 3 and 5 is flexibly carried from the vehicle body, so as to provide a relatively soft suspension which is secondary to the hard primary suspension constituted by the supporting and guiding air cushions.
  • the vehicle body is connected to a double-sided linear induction motor stator 7 having two opposed and longitudinally extending magnetic structures 8 (FIG. 2) each formed with a three-phase winding 9 and arranged to embrace in spaced relationship an electrically conductive and nonmagnetic reaction plate mounted generally vertically on the track perpendicular to the support surfaces d.
  • the reaction plate 10 forms part of a reaction rail 1 ll of which the arran gement is later to be described in detail.
  • FIG. 3 shows the stator 7 in greater detail and in dicates how it is attached to the vehicle body.
  • the magnetic structures 8 are attached to a carriage formed of two backing members l3 integrally connected together by three longitudinally spaced yokes l4.
  • each backing member 13 Adjacent the center one of these yokes M, each backing member 13 is formed with a lug 15 at each side of the carriage, and these lugs form connection points at which the stator is connected to a cross member 17 of the vehicle body by two longitudinally extending drag links 18 forming part of a linkage 19 now to be described.
  • the drag links 18 are terminated beyond the lugs 15 by rubber thrust pads 20 and extend loosely through the lugs to their other ends. On these other ends the drag links are pivotally connected at 22 to inwardly directed arms 23 carried by pivot spindles 2 1.
  • the pivot spindles 24 are each journaled for rotation about a vertical axis at a respective connection point on the vehicle body provided by the cross member 17, and carry at their top ends further arms 26 which are directed away from the cross member 17 in the direction of, and generally parallel to, the associated drag links 18.
  • Slots 27 are formed in the cross member 17 to accommodate the arms 26.
  • Each spindle 24 and its associated arms 23 and 26 constitute a crank which is generally indicated in the drawings by the reference numeral 28.
  • the arms 26 are rotatably interconnected by a cross link 29 extending transversely of the motor.
  • each magnetic structure 8 In operation the windings 9 are energized from a three-phase supply and in known manner each magnetic structure 8 generates a magnetic field which travels longitudinally of the motor in the direction of the arrow T (FIG. 3).
  • the magnetic fields due to the two structures are additive and combine together to create magnetic flux which passes between and along the structures 8 in a series flux path which is directed longitudinally of the motor and which passes twice through the reaction plate 10.
  • the flux induces currents to flow in the plate, and these currents interact with the flux to produce propulsive force in the direction of the arrow
  • the linkage 19 is provided to transmit this tractive force to the vehicle body.
  • the tractive force is transmitted equally by the drag links 18 in tension, the cranks 28 being stationary and held in symmetry (as shown) about the iongitudinal center line of the stator by the cross link 29 in tension. It will be noted that the drag links are coplanar with the line of action of the tractive force so that little or no tilting moment is exerted on the stator by the tractive force.
  • the primary and secondary suspensions previously described allow the vehicle body to undergo relative movement with respect to the track other than the desired movement along the track.
  • Five such movements are possible, and these are: translational movement in the lateral direction; translational movement in the vertical direction (heaving); rotational movement about a horizontal transverse axis (pitching); rotational movement about a vertical transverse axis yav/ing); and rotational movement about a longitudinal axis (rolling").
  • the linkage 19 is substantially incapable of transmitting any of these five movements of the vehicle body relative to the track to the induction motor stator.
  • the two translational movements and the pitching and rolling movements are accommodated by small swinging movements of the drag links 18 pivoting at their ends.
  • the rubber thrust pads 20 have spherical faces for engaging corresponding spherical faces formed on the lugs 15, and the pivotal connections 22 are of the universal variety.
  • a yawing movement of the vehicle body relative to the track is accompanied by adjustment of the linkage 19 as follows. Supposing, for example, that a cross wind or other disturbance exerts on the vehicle body a force such that relative to the track the cross member 17 is urged to rotate in a horizontal plane and clockwise as seen in FIG. 3; the linkage 19 is thus subjected to an unbalance force which is superimposed upon the tractive force transmitted equally by the two drag links 18 and which is in a sense to cause the cranks 28 to rotate in clockwise senses. In response to the unbalance force, the cranks rotate in a clockwise sense until they adopt an angular position appropriate to the magnitude of the yawing movement of the vehicle body.
  • the pivotal mountings and connections involved in the linkage 19 are of low frictional resistance so that the unbalance force is not allowed to attain a large value, and the position eventually adopted by the cranks is such that the forces in the two drag links are again equal.
  • the stator 7 may be reconnected in a plugging or regenerative mode, and a second linkage 31 identical to the linkage 19 is arranged back-to-back with the linkage 19 as shown in order to transmit the braking force to the vehicle body by substantially equal forces in its two drag links, in an identical manner to the transmission of tractive force by the linkage 19.
  • the linkage 19 is inoperative as is the linkage 31 during propulsion.
  • each linkage l9 and 31 transmits between the stator and the vehicle body only force which is directed substantially longitudinally of the track. Relative movement of the vehicle body and stator in any one of the five senses mentioned above is accommodated by the linkages by swinging movement of their drag links 18 and/or by pivotal movement of the cranks 28. At all times the forces in the operative pair of drag links are maintained substantially equal.
  • stator 7 is substantially independent of the vehicle body and so is not subject to the support and guidance provided for the vehicle body by the air cushion pads 3 and 5.
  • Support for the stator is provided by two pairs of laterally spaced air cushion pads 35 carried from the front and rear yokes M by longitudinally disposed pairs of resilient joints 36.
  • the pads 35 are supplied with pressurized air through respective ducts 37 as shown,
  • the joints 36 provide a resilient suspension for the pads 35 and allow the pads to undergo adjusting movement in roll and, to a lesser extent, in pitch.
  • the pads 35 which, like the pads 3 and 5, may be confined by air curtains and/or by flexible skirts, have operational characteristics such that they tend to maintain themselves at a substantially constant clearance above the co-operating track surface 4. They, therefore, support the stator for co-operation with the reaction plate at a substantially constant distance from the track; also, by reason of their substantial lateral spacing on either side of the longitudinal center line of the vehicle, they stabilize the stator in roll by maintaining the stator at a substantially fixed angular position relative to, and transversely of, the track.
  • Stator guidance is provided independently of the stator support and roll control by wheels 32 which are vertically mounted on levers 33 pivoted at the ends of the backing members 13 and are biased into running contact with the reaction rail 11 by springs 34 disposed between the levers 33 and the associated backing members.
  • the wheels are arranged in mutually opposed pairs and contact the reaction rail in a single horizontal plane lying between the reaction plate 10 and the track. They are, therefore, incapable of transmitting any substantial stator rolling moment to the reaction rail.
  • the guidance provided by the wheels 32 is such as to maintain substantially equal the air gaps between the magnetic structures 8 and the reaction plate 10. This is desirable for, inter alia, reducing the possibility of contact between the magnetic structures and the plate.
  • stator guidance means so that they are incapable of transmitting any substantial stator rolling moment to the reaction rail has many ad'- vantages and enables the reaction rail to be more satisfactorily used for stator guidance than has hitherto been possible.
  • the means for providing such stator guidance may be satisfactorily arranged to co-operate with the reaction rail between the reaction plate (i.e. the electrically active part of the reaction rail) and the track, so separating from one another the reaction rail functions of producing propulsive force and providing stator guidance and reducing the bending movements produced on the reaction rail by the lateral guidance forces.
  • stator guidance means to be incapable of transmitting any substantial stator rolling moment is that the guidance means can be simpler than would otherwise be possible, since they do not have to co-operate with each of the opposed reaction rail surfaces at two or more areas of co-operation which are spaced transversely of the rail.
  • the reaction rail 11 is arranged as follows: the reaction plate 10 forms an integral part of a rail member 38 which is made of an electrically conductive and nonmagnetic metal such as aluminum and which comprises, in addition to the plate 10, a thickened portion 39 and a flange portion 40 remote from the reaction plate.
  • a rail member 38 which is made of an electrically conductive and nonmagnetic metal such as aluminum and which comprises, in addition to the plate 10, a thickened portion 39 and a flange portion 40 remote from the reaction plate.
  • the plate 10 is not required for stator guidance, its thickness can be chosen to satisfy in an optimum manner the electrical requirements for induction motor operation.
  • the thickened part 39 forms no part of the induction motor per se, its thickness can be chosen to satisfy in an optimum manner the mechanical requirements for guiding the stator along the track and for supporting the reaction plate in free space.
  • the rail member 38 as a whole is supported generally in a vertical plane by a plurality of longitudinally spaced mountings 41 each disposed between the flange portion 40 of the rail member and the track 2.
  • Each mounting comprises a rigid and generally U-shaped member 42 (FIG. 2) which is bolted to the track at its base and carries from the inturned end of each of its arms a member 43 formed with two longitudinally spaced and downwardly extending leaf springs (not visible) lying on a common plane directed longitudinally of the track.
  • each mounting 41 Between the members 43 of each mounting 41 is disposed a central member 45 (FIG. 4) which is generally in the form of an inverted U and of which each of the two arms is provided by a leaf spring 46 disposed on the common plane of the leaf springs of the associated member 43. At each side of a mounting 41 and associated leaf springs are connected together at their free ends.
  • each central member 45 The modulus of elasticity of each leaf spring 46 is the same as that of the leaf springs of the associated member 43 in combination and the lengths of the leaf springs are also the same, with the result that the lateral guiding force exerted on the rail member by the wheels 32 causes substantially only lateral movement of the rail member with little or no tilting or vertical movement.
  • This resilient mounting of the rail member 38 increases by a considerable extent the amount of reaction plate misalignment which is tolerable by the guide means.
  • the invention is in no way limited to air cushions for providing support and roll control for the stator by cooperation with the track.
  • the air cushion pads 35 are replaced by wheels mounted on horizontal axes to run on the track.
  • FIGS. 4 and 5 show the second embodiment of the invention and with reference to which the following description is given.
  • the first and second embodiments are in many respects similar to one another and the same reference numerals are used where appropriate.
  • the second embodiment of the invention is the same as the first embodiment in so far as the prepared track, the reaction rail and the stator guidance is concerned, but differs in the stator support and roll control provided.
  • the stator is hung from the vehicle body by four hydraulic actuators 50 corresponding generally in position (in plan view) to the air cushion pads 35 of the first embodiment.
  • the actuators 50 are generally vertical, being pivotally supported at their top ends by beams Sl forming part of the vehicle body and being connected to the stator at their bottom ends by further pivotal connections made to lateral extensions of the front and rear yokes l4.
  • the actuators 50 form part of a servo-system and are controllable both in unison and differentially so as to maintain the stator along its length at a substantially constant height above the track and also to prevent the stator from undergoing any substantial rolling motion relative to the reaction rail. It will thus be appreciated that the actuators are functionally equivalent to the air cushion pads 35 of the first embodiment but support the stator from the vehicle body as opposed to from the track.
  • Actuator control may be conventional, basically comprising sensors (not shown) for sensing the stator inclination and height relative to the track, and control gear 52 responsive to the sensor output signals for controlling the hydraulic supply to the actuators so as to maintain the statorinclination and height substantially constant.
  • a modification roll control is performed by only one of the pairs of laterally spaced actuators; the other pair of actuators, preferably the pair at the front of the stator, is used only for height control.
  • stator guidance is provided by wheels the invention is not so limited and other forms of stator guidance may be used.
  • air cushion pads may be used in addition to wheels for providing stator guidance by cooperation with opposed faces of the reaction rail.
  • stator guidance is provided wholly by air cushion pads since there need then be no contact between track and vehicle. However, this is likely to be difficult to achieve satisfactorily in practice because of the small degree of lateral movement which can be tolerated between the stator and the reaction rail.
  • the wheels and/or the stator guidance pads are preferably arranged on a common plane and on the corners of a rectangle (as shown for the wheels 32) such an arrangement is not essential; the wheels and/or pads may be not co-planar and numbers other than four (and greater than three) may be used.
  • the arrangement is such, however, that the guide means are incapable of transmitting any substantial stator rolling movement to the reaction rail.
  • Stator guidance need not necessarily be performed by co-operation with the reaction rail between the reaction plate and the track, but such an arrangement is desirable because the functions of the rail to produce propulsive force and to provide stator guidance are thereby separated from one another.
  • Using the reaction plate itself for stator guidance to some extent enables the height of the reaction rail to be reduced, but is likely to require a compromise so far as electrical requirements are concerned, with a resulting decrease in induction motor efiiciency.
  • FIGS. 3 and 5 for conmeeting the stator to the vehicle body, although preferable, is not essential.
  • the connection should, however, be such that only longitudinally directed forces can be transmitted between the stator and the vehicle body.
  • stator support and roll control are both effected by the same devices, in some arrangements in accordance with the invention these functions are performed separately of one another.
  • the invention is not limited to air cushion vehicles having a stator adapted for cooperation with a reaction rail projecting upwardly from the associated track, but may be applied to vehicles having a stator adapted for co-operation with a downwardly depending rail.
  • a vehicle for operation along a prepared track comprising a double-sided linear induction motor stator for propelling the vehicle by electro-magnetic cooperation with a generally vertical and electrically conductive reaction plate forming part of a reaction rail mounted on the track, means connecting the stator to the vehicle body for independent movement with respect thereto except in a substantially longitudinal direction, guide means carried by the stator and adapted for co-operation with the reaction rail for maintaining the stator substantially at a predetermined lateral position relative to reaction rail despite substantial lateral movements of the vehicle body relative to the track, the guide means being arranged so as to be incapable of transmitting any substantial rolling mo ment to the reaction rail, support means for supporting the stator substantially at a predetermined vertical position relative to the reaction rail despite substantial vertical movements of the vehicle body relative to the track, and roll control means for providing the stator roll stability.
  • a vehicle according to claim 2 wherein the vehicle is adapted for operation above the track and includes means carried by the stator for co-operation with the track at each side of the reaction rail whereby to support the stator whilst also providing the stator with stability in roll.
  • a vehicle according to claim 4, wherein the said means comprise air cushion pads movably attached to the stator and arranged to be stiffer in pitch than in roll.
  • the means connecting the stator to the vehicle body for independent movement with respect thereto except in a longitudinal direction comprises a pair of links extending longitudinally of the stator between the respective connection points of a first pair on the two sides of the stator and a second laterally spaced pair carried by the vehicle body, at one of their ends each link being connected to a lever arm of a respective crank, the two cranks having further lever arms interconnected by a connection therebetween and rotatable in operation to maintain the forces separately transmitted by the links substantially equal.
  • the guide means comprises means for forming and maintaining at least one cushion of pressurized air in co-operation with each of two opposed side surfaces of the reaction rail.
  • reaction rail comprises a resilient mounting by which the reaction plate is mounted on the track and which allows lateral movement of the reaction plate in response to lateral forces imposed upon the reaction rail by the guide means.
  • a vehicle for operation along a prepared track comprising a double-sided linear induction motor stator for propelling the vehicle by electro-magnetic co-operation with a generally vertical and electrically conductive reaction plate forming part of a reaction rail mounted on the track, means connecting the stator to the vehicle body for independent movement with respect thereto except in a longitudinal direction, guide means carried by the stator and adapted for co-operation with the reaction rail for maintaining the stator substantially at a predetermined lateral position relative to the reaction rail despite substantial lateral movements of the vehicle body relative to the track, the guide means being arranged so as to be incapable of transmitting any substantial rolling moment to the reaction rail, and means for supporting the stator substantially at a predetermined vertical position relative to the reaction rail despite substantial vertical movements of the vehicle body relative to the track whilst also providing the stator roll stability.
  • a vehicle for operation along a preferred track comprising a double-sided linear induction motor stator for propelling the vehicle by electro-magnetic co-operation with a generally vertical and electrically conductive reaction plate forming part of a reaction rail mounted on the track, means connecting the stator to the vehicle body for independent movement with respect thereto except in a longitudinal direction, guide means carried by the stator and adapted for co-operation with the reaction rail between the reaction plate and the track for maintaining the stator substantially at a predetermined lateral position relative to the reaction rail despite substantial lateral movements of the vehicle body relative to the track, the guide means being arranged so as to be incapable of transmitting any substantial rolling moment to the reaction rail, and means for supporting the stator substantially at a predetermined vertical position relative to the reaction rail despite substantial vertical movements of the vehicle body relative to the track whilst also providing the stator roll stability.
  • a vehicle for operation along a prepared track comprising a double-sided linear induction motor stator for propelling the vehicle by co-operation with a generally vertical and electrically conductive reaction plate forming part of a reaction rail mounted on the track, means connecting the stator to the vehicle body for independent movement with respect thereto except in a longitudinal direction, guide means carried by the stator and adapted for co-operation with the reaction rail between the reaction plate and the track for maintaining the stator substantially at a predetermined lateral position relative to the reaction rail despite substantial lateral movements of the vehicle body relative to the track, the guide means being arranged so as to be incapable of transmitting any substantial stator rolling moment to the reaction rail and comprising a plurality of wheels adapted to run on opposed side surfaces of the reaction rail in a common plane of contact between the reaction plate and the track, and means for supporting the stator substantially at a predetermined vertical position relative to the reaction rail despite substantial vertical movements of the vehicle body relative to the track while also providing the stator roll stability.
  • An air cushion vehicle for operation along and above a prepared track and comprising a double-sided linear induction motor stator for propelling the vehicle by electro-magnetic co-operation with a generally vertical and electrically conductive reaction plate forming part of a reaction rail mounted on the track, means connecting the stator to the vehicle body for independent movement with respect thereto except in a substantially longitudinal direction, air cushion means carried by the stator for forming and maintaining at least one cushion of pressurized air in co-operation with the track at each side of the reaction rail whereby to support the stator whilst also providing the stator with stability in roll, said air cushion means comprising air cushion pads movably attached to the stator and arranged for forming and maintaining the said cushions of pressurized air, and guide means carried by the stator and adapted for cooperation with the reaction rail for maintaining the stator substantially at a predetermined lateral position relative to the reaction rail, the guide means being arranged so as to be incapable of transmitting any substantial rolling moment to the reaction rail.
  • An air cushion vehicle for operation along a prepared track and comprising a double-sided linear induction motor stator for propelling the vehicle by electro-magnetic co-operation with a generally vertical and electrically conductive reaction plate forming part of a reaction rail mounted on the track, means connecting the stator to the vehicle body for independent movement with respect thereto except in a substantially longitudinal direction, guide means carried by the stator and adapted for co-operation with the reaction rail for maintaining the stator substantially at a predetermined lateral position relative to the reaction rail, the guide means being arranged so as to be incapable of transmitting any substantial rolling moment to the reaction rail, at least one generally vertical connection pivotally connected between the stator and the vehicle body on each side of the reaction rail, and control means for controlling the lengths of the connections to support the stator whilst also providing the stator with stability in roll.
  • a vehicle for operation along a prepared track comprising a double-sided linear induction motor stator for propelling the vehicle by electro-magnetic co-operation with a generally vertical and electrically conductive reaction plate forming part of a reaction rail mounted on the track, means connecting the stator to the vehicle body for independent movement with respect thereto except in a substantially longitudinal direction, guide means carried by the stator and adapted for co-operation with the reaction rail for tive to the reaction rail despite substantial vertical movements of the vehicle body relative to the track, and roll control means for providing the stator roll stability.

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  • Engineering & Computer Science (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Control Of Vehicles With Linear Motors And Vehicles That Are Magnetically Levitated (AREA)
  • Linear Motors (AREA)
US21273A 1969-03-21 1970-03-20 Vehicle propelled by linear motor Expired - Lifetime US3680489A (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
GB1513969 1969-03-21
GB1513769 1969-03-21
GB1513869 1969-03-21

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US3680489A true US3680489A (en) 1972-08-01

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US21273A Expired - Lifetime US3680489A (en) 1969-03-21 1970-03-20 Vehicle propelled by linear motor

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US (1) US3680489A (de)
DE (1) DE2013197A1 (de)
FR (1) FR2041092A1 (de)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3874300A (en) * 1972-03-15 1975-04-01 Dauphinoise Electr Soc Suspension and coupling device for the movable magnetic field unit of a linear induction motor
US3882790A (en) * 1972-07-17 1975-05-13 Krauss Maffei Ag Rail system for magnetic suspension vehicles
US3937149A (en) * 1972-07-17 1976-02-10 Krauss-Maffei Aktiengesellschaft Rail system for magnetic-suspension vehicles
US4217829A (en) * 1977-03-18 1980-08-19 Heidelberg Goetz System and vehicle to be held magnetically
US4658731A (en) * 1983-11-26 1987-04-21 Schumann Horst G Apparatus for transporting goods to and from shelves having dual function guide rollers
US5542356A (en) * 1991-08-09 1996-08-06 Richert; Withold Track-guided transport vehicle
US5970881A (en) * 1997-01-23 1999-10-26 Otis Elevator Company Linear type shuttle with movable linear motor primary
US6183615B1 (en) 1992-06-26 2001-02-06 Tokyo Electron Limited Transport system for wafer processing line
US6520272B2 (en) * 2000-07-25 2003-02-18 Samsung Electronics Co., Ltd. Micro robot
US6591757B1 (en) * 2001-12-26 2003-07-15 Anorad Corporation Motor driven high stability brake for linear motion systems
US20150034401A1 (en) * 2011-02-21 2015-02-05 Novus Finitor B.V. Levitation System for a Train

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3460485A (en) * 1966-06-15 1969-08-12 Hovercraft Dev Ltd Electromagnetically-propelled vehicles
US3500765A (en) * 1966-09-13 1970-03-17 Hovercraft Dev Ltd Gas-cushion vehicles

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3460485A (en) * 1966-06-15 1969-08-12 Hovercraft Dev Ltd Electromagnetically-propelled vehicles
US3500765A (en) * 1966-09-13 1970-03-17 Hovercraft Dev Ltd Gas-cushion vehicles

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3874300A (en) * 1972-03-15 1975-04-01 Dauphinoise Electr Soc Suspension and coupling device for the movable magnetic field unit of a linear induction motor
US3882790A (en) * 1972-07-17 1975-05-13 Krauss Maffei Ag Rail system for magnetic suspension vehicles
US3937149A (en) * 1972-07-17 1976-02-10 Krauss-Maffei Aktiengesellschaft Rail system for magnetic-suspension vehicles
US4217829A (en) * 1977-03-18 1980-08-19 Heidelberg Goetz System and vehicle to be held magnetically
US4658731A (en) * 1983-11-26 1987-04-21 Schumann Horst G Apparatus for transporting goods to and from shelves having dual function guide rollers
US5542356A (en) * 1991-08-09 1996-08-06 Richert; Withold Track-guided transport vehicle
US6183615B1 (en) 1992-06-26 2001-02-06 Tokyo Electron Limited Transport system for wafer processing line
US5970881A (en) * 1997-01-23 1999-10-26 Otis Elevator Company Linear type shuttle with movable linear motor primary
US6520272B2 (en) * 2000-07-25 2003-02-18 Samsung Electronics Co., Ltd. Micro robot
US6591757B1 (en) * 2001-12-26 2003-07-15 Anorad Corporation Motor driven high stability brake for linear motion systems
US6715426B1 (en) * 2001-12-26 2004-04-06 Anorad Corporation Motor driven high stability brake linear motion systems
US20150034401A1 (en) * 2011-02-21 2015-02-05 Novus Finitor B.V. Levitation System for a Train
US10293803B2 (en) 2011-02-21 2019-05-21 Novus Finitor B.V. Levitation system for a train

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Publication number Publication date
DE2013197A1 (de) 1970-10-08
FR2041092A1 (de) 1971-01-29

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